Kako Sansei

Japanese: 河鼓三星 - かこさんせい
Kako Sansei

…Alpha star Altair (the flying eagle) is a bright star of type A7 with a magnitude of 0.8, and is famous as the Tanabata star Altair (Japanese name: Hikoboshi). On either side of it are beta star with a magnitude of 3.9 and gamma star with a magnitude of 2.7, forming a straight line like a triple star. In China, this is called Hegu Sanxing, and in Japan, it is called Inukai Star. Eta is a Cepheid variable with a magnitude of 3.7-4.7, a spectral type of F-G, and a period of variation of 7.1766 days. …

*Some of the terminology that refers to "Hagu Sanxing" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…α星アルタイル(とぶ鷲)は光度0.8等,A7型の輝星で,七夕の牽牛星(和名は彦星)として有名である。両脇に光度3.9等のβ星,光度2.7等のγ星を従え,三ッ星のように一直線に並ぶが,中国ではこれを河鼓三星と呼び,日本では〈犬飼星〉と呼んでいる。η星は変光幅3.7~4.7等,スペクトル型F~G,変光周期7.1766日のケフェイド変光星である。…

※「河鼓三星」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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